Loop antenna radiation and reference loops

摘要

A loop antenna formed of an radiation loop and a reference loop. The reference loop is generally the same size, shape and electrical length as the radiation loop and is located in the near field of and in close proximity to the radiation loop. In communication devices having conductive surfaces, components, shielding and other conductive elements in close proximity to the radiation loop, the coupling to the radiation loop that tends to de-tune or otherwise interfere with the operation of the radiation loop is reduced by the reference loop.